Unauthorized debit order on my account

We resigned the medical aid in Feb 2019. We already used some benefits and they informed us that there will be monies outstanding of +-R5500. A debit ordee has been arranged. There was some problems on my bank account and i closed the account and opened a new one. No authorization was given to Discovery to take monies from my new account. I tried to reverse the debit orders and the monies were not paid back into my account the past 3 months. I did go to Nedbank to stop this order from going off. A dispute was filed beginning January 2020. No one solved the issue yet. I was not even the main member. The medical aid was taken out on my husband's name. Can some of Discovery assist me on this as no one contacted me so far...